/**
  * Get the name of the primary column.
  *
  * @since 2.5.0 / WP 4.3+ compatibility
  * @access protected
  *
  * @return string The name of the primary column.
  */
 protected function get_primary_column_name()
 {
     if (method_exists('WP_List_Table', 'get_primary_column_name')) {
         return parent::get_primary_column_name();
     } else {
         return $this->get_default_primary_column_name();
     }
 }
 /**
  * Added for WP4.1 backward compat (@see https://events.codebasehq.com/projects/event-espresso/tickets/8814)
  * @return string
  */
 protected function get_primary_column_name()
 {
     foreach (class_parents($this) as $parent) {
         if (method_exists($parent, 'get_primary_column_name') && $parent == 'WP_List_Table') {
             return parent::get_primary_column_name();
         }
     }
     return $this->_primary_column;
 }